But (with last 3.5 version of WordPress?) it's seems there is a problem with some functions:

when i do:
/?wpapi=get_posts&dev=1&count=2&page=1
(all is ok without &count=2&page=1)

i have at the end of json output:<b>Warning</b>: Cannot modify header information - headers already sent by (output started at /home/user/domain.ext/wp-content/plugins/wp-api/includes/get_posts.php:1229) in <b>/home/user/domain.ext/wp-content/plugins/wp-api/includes/get_posts.php</b> on line <b>1361</b><br />